66546240 has 112 divisors (see below), whose sum is σ = 213652608. Its totient is φ = 17547264.

The previous prime is 66546229. The next prime is 66546251. The reversal of 66546240 is 4264566.

It is an interprime number because it is at equal distance from previous prime (66546229) and next prime (66546251).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98544 + ... + 99216.

Almost surely, 2^66546240 is an apocalyptic number.

66546240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66546240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106826304).

66546240 is an abundant number, since it is smaller than the sum of its proper divisors (147106368).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66546240 is a wasteful number, since it uses less digits than its factorization.

66546240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 796 (or 786 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 33.

The square root of 66546240 is about 8157.5878787789. The cubic root of 66546240 is about 405.2358327737.

The spelling of 66546240 in words is "sixty-six million, five hundred forty-six thousand, two hundred forty".